London Calling 10 by Robert Kaufman. Heather Flowers. 43"/44" Wide. 100% Cotton Lawn. Cotton Lawn is a plain weave textile made from cotton. It is designed using high thread count yarns which results in it's silky and untextured feel. It is a lightweight fabric and it can be slightly transparent. It is perfect for sewing dresses, skirts, trousers and tops for the warmer weather.